<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>标题标签</title>
</head>
<body>
  <h1>一级标题</h1>
  <h2>二级标题</h2>
  <h3>三级标题</h3>
  <h4>四级标题</h4>
  <h5>五级标题</h5>
  <h6>六级标题</h6>
</body>
</html>